code: def testZeroInput(self):
      # Inputting zeros should return zero. Try with different sizes
      size = 1024
      while size >= 256:
          for n_octave in range(1, 9):
              computed = LogSpectrum(frameSize=size, nOctave=n_octave)(
                  zeros(size)
              )[0]
              output_size = 40 + 36 * (n_octave - 1)
              self.assertEqualVector(computed, zeros(output_size))
          size = int(size / 2)
  
file_path: essentia/test/src/unittests/spectral/test_logspectrum.py
imports: from essentia_test import *
  import numpy
label_desc: Use image node_id 2 for calling the TestLogSpectrum obj's underlying member method code with example usage: obj.testZeroInput() without return types